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Finding the Fourth Proportional to 154,280.80, 231,421.20 and 128,015.20

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Solution

The fourth proportional to 154,280.80, 231,421.20 and 128,015.20 is: 192,022.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,280.80 : 231,421.20 = 128,015.20 : x
  2. Step 2: Convert to fraction form
    154,280.80/231,421.20 = 128,015.20/x
  3. Step 3: Cross multiply
    154,280.80x = 231,421.20 × 128,015.20
  4. Step 4: Simplify right side
    154,280.80x = 29,625,431,202.24
  5. Step 5: Solve for x
    x = 29,625,431,202.24/154,280.80
  6. Step 6: Final answer
    x = 192,022.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.